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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd174821b8e9c8f524c5fe5971dff9bf1ef21d58fbb0202775d720751cc5b8a1' 
  AND token = 'bUhdUqenssKtL6HREY5l5mYPWh9K74cpl4JWMJUOVVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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