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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6625e6574e11097e76ded2e4ba99f437d2c54cac056faa13960583d53609dab6' 
  AND token = '7rF9RiaHT0swRli4DyWQoIkK1ZmAJ7WzkfWdTr6rWpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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