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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bbd791d13379dc9ad70e3aa481b2805be7ab4a8b4fad8e3afffa258b25457d7' 
  AND token = 'AEE6lJ7T5T+845v8VQWAup320PE+46/smceCOL1oja8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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