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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940cf994fcab1c72962c04d7b42ffde0dd5bf5efeb1e1b413b3a76e88c54763e' 
  AND token = '9ZVyGIDoehcueaycExYFLA/COH7ne4cXhIlpZ+U/hcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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