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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d707af4e11171da631fdd5882343afa9992584be153fdbc8054d7038f4992a7' 
  AND token = '6khv3ehikb3fOENiRJ1gSYHd79WgYv/oL+DWyEvquI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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