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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4679b7494c00216914ec49e0fea9bd9ce715a862bb2ecb92a552db4e107565d7' 
  AND token = 'ytR2Nf68/lH6NLZuJ8SLUG6aKShnBpRvSQ39FBSot7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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