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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47629b1df439a7f2d4362ee89e6ea1a6f7fbbbdec7e95ef5b23e32c914dfbca9' 
  AND token = '7CaYOGl4w8ukmJM01+2BtPbJzSgI5LHfkO4Q8Pw4sBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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