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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029df9267470d2d963313a066ed24d3eefd453dd9bb7150013fcc51f2cde6ad5' 
  AND token = 'XK5U263Ju62HKWTw2lFADLe7fyZFNnkJcRJGeezeCD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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