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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f3d185930e7e07ef8a59435fb65813391e8c23a84a9c7459c7225695a704b2' 
  AND token = 'p9gD+d9wlzCR3H6SoUY8MTuE7IB8sRiMMUqaRO/i/lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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