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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee28037eee96b9167815a8ddaa2b34f484fe790f7704f6ea77bd8b21bc69249d' 
  AND token = 'xRMAE6Ddb3zuv3j5QjI2tMSKZWNMkuBMziT3rVhKfbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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