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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e975ac65f9316762786a413b16a5bd65e0e118dffff0695aa3c54807eb89075f' 
  AND token = 'egoL35bLTvh96LGvKtnk1QVe7GUr7YfrH4B0Yp9wjYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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