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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eea6dd90ed6fe9adfe547afd90e855c6cfd3fef9bfced233c68b1b0321434b6' 
  AND token = '75lxmCDPnPS3rxDzuImOISDmFyL1qOqX3Yrg/8FEv5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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