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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd088a3ab3cc4e2d7950e1d055dd4779519a96c5c492dd6c3492e2d1ea2d43f54' 
  AND token = 'iRNx71IjrQ+amoF1U1rNP3hmD5yTKHOs+3LCenfSaN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}