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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0367aae382b50dda8ed096b673d17ddcae07817a7a355a86312482cbdb8f936f' 
  AND token = 'VD8TGzb7qd8Zea8FlqcC8tlecYS1ApUBvoDqEMqCZJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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