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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc98fd9dcd6a07aeb5e0da6e49749ffcde210eef4377e7a2266c73481e85084f' 
  AND token = '8Z1P7sjMDRcZW7U55kOhuDzb3jhdD/YF2J5Y6Yxuz68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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