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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1df62bee506768bae3be016ea0daed0311c033f9e6adb1ff367d1324616ba8' 
  AND token = 'FNWeGumSotwExOKXAG9hp///nQa4iuAH4VNmyTqS0tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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