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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed15317d8da6acd9334b033e595430242ce991eeec02c5420411ec2ddb5f4411' 
  AND token = 'iwe5AWwyHUNVS9adaJg2DmkNr7NH9p9bwQ+crv2JABo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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