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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b67053d20097f75a14b3230ea69a6a964c5341951986fab2405099dc3419f42' 
  AND token = 'wKZ5dOkFnTRLeaPT/9eS4YMPI4fp2hpMV+3j/C7nG9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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