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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '062a8cf707977b30a66729baf809e2fdcccd0218ef7470b4a9a3bf8080264a65' 
  AND token = 'xJ7T0b3APm8BlNwpyAT0BXH5OZH5/0bVnRWmLqnW3SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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