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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97eca26ebc6ebbf1a97ef493631c674a0ee83f4d6e0492ae3702d5401fd651b3' 
  AND token = 'LcGh/pVMpcHZVEv6vWzObeYW0uIbi4lj+9NZDxjo9OM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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