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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0fd3db26f2ce144a772da5923fe329405b6965e90a548878cf536624f184f5f' 
  AND token = 'JuAWd/E9st/qS2eae7vGG2tThamfgedw/H8BRdqMHqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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