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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca805fc5aa6ca5558cc6dbf28d4a5a9bbf10710516c7be05c837f74ff6ae912a' 
  AND token = 'enCE/TtQ0HfMqM1GSeTvNqGxPWJJUOSX98h7evbywA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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