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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '783429474b15ed753a17f8b4d2b0b9a8d3e447aa5cb25d3c93b143aee7576f00' 
  AND token = 'EogFF7k7KRUU7ZoPRmNfkafIgQlZknPK2eCfXXcjW/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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