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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '119c7b07ad8682bf23450b43217d972b00f8e0c0d35f94d48317ba0cf91befaf' 
  AND token = '2kv6mMnZqbyuHr8XIQFs+8bIAHfVWe6kXLkKLttcQNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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