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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44b54c8c5d8a2fa57114390bdedb4f4c9edafdf18293e22d90eb0d473a88336' 
  AND token = 'FTWwF7DRyA3B3L8um/xHriV4ZCsUDU4IPqyyzG0liLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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