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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710c9838e3e475959b09c0cdf9fa2a943d382b94e497775245fc2c91369fde86' 
  AND token = 'mxoyuAtTb2ZwTET6y1if3Il/xjkXDfmhe0ZNameLd68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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