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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7524695dd694545af27e62b4b24832f03a4c48077d12b1c92aca60dea35be0f5' 
  AND token = '1SpHYOGwHL1jbhSw2I6ecIYYmRU7Ul8SRMkeJIVWi+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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