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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd20de56826d134996caacf9301f95b92dd1d06c1f96a1b6aced739dc8031bfb9' 
  AND token = 'on948qUjBExtPEmpSJpNKJheWTKuLRdhn+ZONtPcaJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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