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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71a5f7fbb60451c6cc03bf2f1d5d725539200c6093833adff60aab4fef32cca' 
  AND token = '0wVv317kINAa3Z0Ie5M4E7iJgVv+2l7tvfv1NgKdXpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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