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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c91df1743b073d4f4d7c812de60a61bff16db9fdc5117b8f445b334d5d2823' 
  AND token = 'jGom+j4YFjiVjMwbb9YqI7yy8V4Oht8s5f3Qaav47tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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