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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6fdb01a10b7f8c88feb19c8fd58c9cc2d271c00973953013a5c8f08f421ffc3' 
  AND token = 'gt5xLyxH05pxH1Tcdl69KhF6uZYdH4xEAsE5cg4VvCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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