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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1734faac27d517549a74998e72fe4cb27328bb7140dd76129ba2b57d6f5331e' 
  AND token = 'SCimMbdeBnL6ERhaIzeVxc9PzNDIZS0Yw8ozJEBUzwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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