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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebda6e1e915ba1b0b5cfb33b9b716aa4e1beabb243d08b08da21e6406a5c3e11' 
  AND token = 'gkHi/4IxjucqT+R3gaoHS/TL0RznjpVr+9iwDyKSzyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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