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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc1ff6be3b7fcf36012b3ca0bf7e0a2ac603ca767a9b2c9ca2b8d091e6a6298' 
  AND token = 'x+0ISv0tXpIpgIFhgwCJoYqdmqx29Is7QgLmpXlULt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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