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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b3aec011a11eeccca486d0832b01c814806d4aa5907047ca8909f6c55767f7a' 
  AND token = 'xYgEOXWRjnEt/sI3ILjW5snS6RMjXcMI7ngV1Jsiz9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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