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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5630c7ff43fb013086a4b6aef764eac19a3e236f6c97260093b488f0f700524' 
  AND token = 'NslafT5c59BoqY55ME8sQD8dYNWHAtBl0ZsG2sdpl58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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