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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26eaeac88d10236b191faf3974a4a73f03fa19d89305a81783aaea45fcc943ef' 
  AND token = 'lTPLlaK8MJh0tVD4tlOEaZgc11f7GS3DVmM+6sdaOXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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