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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810794cd4fcc29bcfda147d331f4ad3bf0d3fa9657af4f27bcc8fd19983a1413' 
  AND token = '8oUwQFntqRrJP0AAA1B6OhGHs4fpa1QUQFoO70FrTS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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