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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4109b8bdabea26815c8afff37ebea51961a5bc312e45a9023ddad1accef853c' 
  AND token = 'hCPhue+9wEcB8QvGvbaXBZ83xnNJ4qsdF/DDBZoWPyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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