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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b5e35bf6dfee41cfb070d77271b0f8f18540d664f2830b7fab4eef018a19ae2' 
  AND token = 'MGX/wY0AFdUASV0FNZxbscl3cC5h3fT+ZInznf8JizQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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