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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9da216b7f9892930e76f0e95b47e5e6f5404c06036e863e16bee1b2e65aca6d' 
  AND token = '1bBC8S3bH2ECDCkS0g+w9rvxaD4tDaHF0tb7rYd/pt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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