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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49e2a7734bf10abb25b307359891a34ce20e534fa09f352ffd23d519adb54b85' 
  AND token = 'YdewImiYd3ssFgghjn2DbaKWMKmbkLZpshAb3K3yLYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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