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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ef93d700b04a5e6ac366b50cf0cab4bcd28cd50b9ec118cae589b91d7a1afc6' 
  AND token = 'G9F+fuYFxqlQa79IGSM0lZK+AgADLqgBod7uQVj7IFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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