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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a598a4137f50b0ef4695e257b988c26c0e66f32ae966de9e581a43692d3aa4c' 
  AND token = 'pDTQoISYloGoK8HYOgqhH7+94JL8Sgg55ACE5wssIqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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