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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b422c4ce358a7ee18387cc8a1787dac7b052276cd04ffd94794f32264e2b9e12' 
  AND token = 'FwiHdOzot1rsAhnScMs7bsC8I9dkbQ1vDBVyV7co3ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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