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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6226c9dac28f68e18884f6ccfb2bc8d3955c2909e78ced3939702c25248dbc37' 
  AND token = 'dNn4wR0P84LHCS4vUanxaviJFqFzSuzer+l3UBEecFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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