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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6987ae59ed5c4a9221fc9c79405d099010e22033ad732ad12b315cce5930817' 
  AND token = 'jfjFMnKkpudRWSdZ83b7BRrN+M1OmBO+R8369Q/693o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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