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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e46af2e3937443d0073b1649b7b0863711d85f51caceb7afef5ae2e9d31fdfa' 
  AND token = 'R3hQLo0kiiHJD8tNqCSKoPo/lY/xTg+/vrPePoFyoaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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