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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '857d416b8ee38dfe4c0a747671034b9d854ac65edd5361692047706d5e99cee3' 
  AND token = 'i548eDWj9G/4b2MKB26GMmEbWFTnC7FU76RZK0QY3Aw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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