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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41277d8b51475446948fac88d0e2fed4018239b61a265a9b31b47942d8e07a84' 
  AND token = 'xdtHc4N7korGacgEet6QKbE4hLBl2w0mYADP+QO94gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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