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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650eaf75fe256ea1f63e4085f85e2bf65fc0a089c9a3effaa8d355a11aee36c2' 
  AND token = 'spksOSgja7hGNME0Oqlv2BHXLaISEt14+emKwVBQBxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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