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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b9fad121d64a0c4490c719f85724cb94ec34431b50ad9c15eca4f4b3b7f8a8' 
  AND token = 't/hji6xuVyob+hdEeM2kHVP+3QRw5DKF3AQbRkH/6H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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