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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcdd72f85bd8687ca44dc84d0934220dacdcc1a4d2011fb449b948388757c1ff' 
  AND token = 'Fi4LwmqgmtXdTABkzO16KI7hU6UjhNwao5hW8M8CRH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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