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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ebc88a63de3d14dd2584618f0d780c02ffe5fe275ff0887d337f0587ae21356' 
  AND token = 'ObozF4/zkPVTrSAt/q8U2vYAb50SWcr2vfQm3N8gDag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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