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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b20897a373cb2ba7031b46abc222fb62b7a571648042200c66dea78d132747' 
  AND token = 'WyCTv2+EDXMsEQnzp9cjFK8+yz+shC9ts5DcOqRQ92Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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