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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e632bcb32d58382c39db0cf4f9c6974353e23afec9848b72298c90a143c24f6c' 
  AND token = 'AIPTkNJKfq4UrwSLWJ6f6OsCR6L+xTc3pc8L8BWtfuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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