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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669a968b87082dd6cba873897136c1852dd9c54ae1c445a770e4771d7a8a6b61' 
  AND token = 'ZlpNcd4AznFIVyIdimo5iGcbKlhJ3R/Xr4328WJi1NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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