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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2fca9f7eabb7c3880c202ac24b615c4cb62f4452753d9b5cd6663702c3c5075' 
  AND token = 'eUQu3PnouSjBYOh5/lTkCaYIebzWo+qvCyqUQyTSJ+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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