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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a77ebe28ba633c43a034efa6f39264bddd4d9c63dd8fe31ec97af6a597dab33' 
  AND token = 'H7JvR7v82ob+ZVcouUZbH/ZG3ZkjWgZuNWYg0EXmw7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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