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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c20a9be77cba9b0464ab86cd3feedf8b2fcc1798c080ced4b8062f49598f54' 
  AND token = '6JdLEt1G9EnSrvgBRUVyjLI3BwJxx5Rk4CoFGbkDEls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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