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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35b6f5724dba1b21364e7563f3143da8b85d7f405071daf0b7f125991790c0e2' 
  AND token = 'SfmJlTkVfWa0Q96gLOCfPFYO0pLs+IkSKPaEQTTob/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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