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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adcf4f5cf10d75664eac2af5c8c92e14d0d2c017d29b44b40d0c7cee8f611df3' 
  AND token = '+rStVvYguU8zP6ftCBExEmx7f7V+upa8Ako55lOOhjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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