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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30bc44a654be6edcf598bf811bf777c90124c60135e978c165484beb1077f382' 
  AND token = 'uMboo03Ijac8qirJbjqT6PqRE8ao3L2K/CrCPQK/hIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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