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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '211314c80b70d5f2205ed5145b664351b18d90b2f64db9023ad3dcce11c7290a' 
  AND token = 'yMkGevUldNLR9ooe0VIdnmDFj/iSJY2ByNvyYf8tViI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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