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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a28889cf4f32cf61ea66f2968a5a5ba407cc45db5ef6dbac34f69681d09a876' 
  AND token = 'YtIwlSVn1taMPQLllffZOBpD2ZCDMsI4YcCYFT6fOmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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