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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7cad2e41e7a7cf5b420e73cbf1006a2ea407d2448ad39e4b5cdf0e56403e39' 
  AND token = 'cYfIS4/gNY6ll10dlbVCFly5i2kJDneJm9d1w8uokUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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