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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7bad35d4e5ddad56b7fe1bca400687b5006601db7ab19f95a831c90c3ac4f3' 
  AND token = 'wkfVrazAQoTrb7406TqJyqy00xNFbLygL+sS89B1nJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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