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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1b0d5f4d9f77ad235758bfc576518cfc94b5c72c6d3cd44fa942cccd09b47b' 
  AND token = 'mkTvyuL4YLXU3BYFwrDCBd6eTqzkfbV9j8FRs10wklQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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