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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a30ea038c27a020c37d2cfba75e869cb3395edba8eae8cfc3b16e92d951cad5' 
  AND token = 'oRr0ItPar+6e6GTY8yrLhTIJJjIfQ4st8TpWxAlbGac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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